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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-23 16:48:54 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-31 16:07:59 +0300 |
| commit | 36991ca68db9dd43bac7f3519f080ee3939263ef (patch) | |
| tree | 49a095083f83399fa032a7e3264a1509d79dc983 | |
| parent | 2c1cf00eeacb784781cf1c9896b8af001246d339 (diff) | |
| download | linux-36991ca68db9dd43bac7f3519f080ee3939263ef.tar.xz | |
blk-mq: protect debugfs_create_files() from failures
If debugfs were to return a non-NULL error for a debugfs call, using
that pointer later in debugfs_create_files() would crash.
Fix that by properly checking the pointer before referencing it.
Reported-by: Michal Hocko <mhocko@kernel.org>
Reported-and-tested-by: syzbot+b382ba6a802a3d242790@syzkaller.appspotmail.com
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | block/blk-mq-debugfs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 90d68760af08..777638f597aa 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -838,6 +838,9 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { static bool debugfs_create_files(struct dentry *parent, void *data, const struct blk_mq_debugfs_attr *attr) { + if (IS_ERR_OR_NULL(parent)) + return false; + d_inode(parent)->i_private = data; for (; attr->name; attr++) { |